Carbon nanotubes (CNTs) are synthesized by the flame fragment deposition (FFD) technique using Iraqi liquefied petroleum gas (LPG) as a source of carbon in a hand-made reactor at a low temperature (160 °C) without using a catalyst. Purification of the multi-walled carbon nanotubes (MWCNTs) is carried out using a two-step process consisting of sonication in 30 wt.% hydrogen peroxide (H2O2) solution at room temperature to remove amorphous impurities adhering to the walls of the CNTs and carbon nanoparticles (CNPs), followed by sonication in an acetone bath to remove the polyaromatic hydrocarbons (PAH) formed during the LPG gas burning. Comprehensive characterizations such as X-ray diffraction (XRD), atomic force microscopy (AFM), thermo-gravimetric analysis (TGA), and transmission electron microscopy (TEM) were conducted to verify the efficiency of the purification process. The results clearly demonstrated that this process is promising for the purification of the synthesized CNTs.

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Green chemistry has become a fruitful approach for the synthesis of semiconductors and nanoparticles with various applications. Herein, we synthesized ZnO hexagonal nanoparticles (HNPs) by green precipitation method using fresh local Ziziphus leaf extract (Rhamnaceae) with a heating range of 60–80 in an alkaline medium. It was calcinated on a furnace at 500 °C for 2 h. to get a very fine and homogeneous pale-yellow powder which is then loaded with either metronidazole or clindamycin. The physical characterizations of the particles’ morphology, size, and purity were measured using the Scanning electron microscope, UV-spectroscopy, and the Fourier transform infrared spectroscope. The size of ZnO nanoparticles (44.63 nm) was measured using scanning electron microscopy (SEM), and the mean crystal size of the precursor (17.37 nm) was measured using X-ray diffraction methods (XRD). The antibacterial activity of these particles was measured against Staphylococcus aureus bacterial strains and analyzed using a “well-diffusion technique” which revealed that metronidazole or clindamycin-containing ZnO nanoparticles showed good bactericidal activity. Keywords

Carbon nanotube is rolled up from one or more graphene sheets concentrically [1]. Depending on the number of graphite layers, carbon nanotubes are classified as single-wall carbon nanotubes (SWCNTs), double-wall carbon nanotubes (DWCNTs) or multi-wall carbon nanotubes (MWCNTs) [2]. Single-wall carbon nanotubes (SWNTs) are a unique class of material that have received an enormous amount of attention over recent years, because of their remarkable mechanical, thermal, electronic and optical properties [3,4]. Syntheses of carbon nanotubes by several methods includes arc discharge, laser ablation and chemical vapor deposition [5], yielding tubes of various diameter and length distributions [6]. Carbon nanotubes are sub-atomic scale containers of graphitic carbons with remarkable electronic, mechanical and warm properties [7]. The synergistic impact of carbon nano